/Engine/Plugins/Compositing/Composure/Source/Composure/Classes/ComposureBlueprintLibrary.h
Returns display gamma of a given player camera manager, or 0 if no scene viewport attached.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintPure, Category="Composure") static void GetPlayerDisplayGamma ( const [APlayerCameraManager](API\Runtime\Engine\Camera\APlayerCameraManager) * PlayerCameraManager, float & DisplayGamma )